Android Kotlin版封装EventBus

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Android Kotlin版封装EventBus

代码封装

添加依赖库

implementation("org.greenrobot:eventbus:3.3.1")

定义消息类

class MessageEvent<T> {var code: Intvar data: T? = nullconstructor(code: Int) {this.code = code}constructor(code: Int, data: T) {this.code = codethis.data = data}
}

定义常量值

object MessageEventCode {const val REFRESH = 0xB001 //刷新const val DELETE = 0xB002 //删除const val ADD = 0xB003 //增加
}

定义注解

@Target(AnnotationTarget.TYPE, AnnotationTarget.CLASS)
@Retention(AnnotationRetention.RUNTIME)
annotation class BindEventBus

定义工具类

object EventBusUtils {/*** 注册*/fun register(subscriber: Any) {EventBus.getDefault().register(subscriber)}/*** 取消注册*/fun unregister(subscriber: Any) {EventBus.getDefault().unregister(subscriber)}/*** 发送普通事件*/fun post(event: MessageEvent<*>) {EventBus.getDefault().post(event)}/*** 发送粘性事件*/fun postSticky(event: MessageEvent<*>) {EventBus.getDefault().postSticky(event)}/*** 判断是否注册Eventbus*/fun isRegister(clz: Any): Boolean {return clz.javaClass.isAnnotationPresent(BindEventBus::class.java)}
}

使用

在Activity中

override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_event_bus)if (EventBusUtils.isRegister(this)) {EventBusUtils.register(this)}
}@Subscribe(threadMode = ThreadMode.MAIN)
fun onMessageEvent(event: MessageEvent<*>) {when (event.code) {MessageEventCode.REFRESH -> {tvMessage.text = "刷新数据"}MessageEventCode.DELETE -> {tvMessage.text = "删除数据"}MessageEventCode.ADD -> {tvMessage.text = "添加数据：${event.data}"}}
}override fun onDestroy() {super.onDestroy()if (EventBusUtils.isRegister(this)) {EventBusUtils.unregister(this)}
}

在Fragment中

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {super.onViewCreated(view, savedInstanceState)if (EventBusUtils.isRegister(this)) {EventBusUtils.register(this)}
}@Subscribe(threadMode = ThreadMode.MAIN)
fun onMessageEvent(event: MessageEvent<*>) {when (event.code) {MessageEventCode.REFRESH -> {tvMessage.text = "刷新数据"}MessageEventCode.DELETE -> {tvMessage.text = "删除数据"}MessageEventCode.ADD -> {tvMessage.text = "添加数据：${event.data}"}}
}override fun onDestroyView() {super.onDestroyView()if (EventBusUtils.isRegister(this)) {EventBusUtils.unregister(this)}
}

发送事件

EventBusUtils.post(MessageEvent<Nothing>(MessageEventCode.REFRESH))

EventBusUtils.post(MessageEvent<Nothing>(MessageEventCode.DELETE))

EventBusUtils.post(MessageEvent(MessageEventCode.ADD, "hello world"))

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